在<textarea>的右侧对齐两个按钮

<div class="container">
  <textarea></textarea>
  <div class="buttons">
    <button>按钮1</button>
    <button>按钮2</button>
  </div>
</div>

.container {
  position: relative;
}

textarea {
  width: 100%;
  height: 200px;
}

.buttons {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

button {
  margin-bottom: 10px;
}